The Cybermen

Cybermen were originally humanoids from the Eath's twin planet Mondas. The people of Mondas began to instert more and more metal parts and artificial pieces into their bodies to keep them alive, making them cyborgs. This led to the race starting to think logically and calculating, showing no emotions. The cybermen also turn other people into cybermen.

They were created by Dr. Kit Pedler and Gerry Davis in 1966, first appearing in the serial, 'The Tenth Planet' which was the last episode featuring the First Doctor: William Hartnell.

A Parallel universe version of the Cybermen appeared in the 2006 series in the two part story: Rise Of The Cybermen and The Age Of Steel'. 'They have also appeared in the spin off series'Torchwood' in the episode 'Cyberwoman'. They would later return in the 2008 christmas special 'The Next Doctor' introducing two types of Cybermen: The Cyber-Shades and The Cyber-King.